This.
Abortion and gay marriage are not abstract cultural concepts, they are real things in the real world which effect people's material lives.
You either stand for everyone's rights, or get the hell out of our way.
Let me be VERY clear. If you are 'opposed' to abortion and gay marriage you are NOT my comrade. To accept your comradeship would be to fall for lies, to betray the oppressed, to help you divide the universal class that socialists should strive to unite in struggle.